Their mass exodus from Burma came after that country’s military launched a crackdown against the Muslim minority group but downpours are making conditions tough for migrants living in flimsy accommodation, often made from bamboo, amid the constant threat of mudslides.

One refugee, Mustawkima, abandoned her first shelter when the soil washed away.

Rohingya refugees build new huts (Wong Maye-E/AP)

With five children under the age of eight, she wanted her new home to be close to relatives living at the base of the hill, so she erected a flimsy tarpaulin halfway up.

But when the rains began in June, the water quickly poured in, transforming her dirt floor into a muddy mess.

She says she hopes her relatives will protect her and her children when the worst of the rains arrive.

Rohingya refugees cross a newly-built bridge in the extended area of Kutupalong refugee camp (Wong Maye-E/AP)

The most intense rains are expected over the next few months, though heavy downpours began pummelling the camps in June.

There have already been more than 160 landslides, 30 people injured and one toddler killed, according to the Inter Sector Coordination Group, or ISCG, which oversees the aid agencies in the camps.

“Within 24 hours of the first rains falling, we were seeing small landslides and we were seeing flooding everywhere,” says Daphnee Cook, a spokeswoman for Save The Children.

The ferocity of the rains and the swiftness with which they can wreak havoc is stunning.